Affleck appeared on ABC This Week on Sunday (November 25) to discuss the group as well as to call on foreign powers to take a more active role in the region.

"There's a huge amount that the US can do, frankly. I mean, we have a lot of levers there," the star explained. "We can engage in the kind of high-level, shuttle diplomacy that you saw be so effective in Gaza."

Affleck went on to suggest that "progress is possible" in the region despite the fact that rebels took control of the city of Goma in recent days.

"[President Obama is] not unaware of this," he insisted. "I appreciate all the other things that he's doing, but this has to be a priority."

He concluded: "I think this is critical. I think our actions in foreign policy - and maybe I am naive - you know, represent our values and represent who we are.

"And if any American were to go to that country and stand and see what was happening there, they would insist that we do what we could."